[release/7.0] Continue using typeof(void) for empty TypedResults

src/Http/Http.Results/test/AcceptedAtRouteResultTests.cs

@@ -85,6 +85,7 @@ public void PopulateMetadata_AddsResponseTypeMetadata()
         // Assert
         var producesResponseTypeMetadata = builder.Metadata.OfType<ProducesResponseTypeMetadata>().Last();
         Assert.Equal(StatusCodes.Status202Accepted, producesResponseTypeMetadata.StatusCode);
+        Assert.Equal(typeof(void), producesResponseTypeMetadata.Type);
     }
 
     [Fact]

src/Http/Http.Results/test/AcceptedResultTests.cs

@@ -41,7 +41,9 @@ public void PopulateMetadata_AddsResponseTypeMetadata()
         PopulateMetadata<Accepted>(((Delegate)MyApi).GetMethodInfo(), builder);
 
         // Assert
-        Assert.Contains(builder.Metadata, m => m is ProducesResponseTypeMetadata { StatusCode: StatusCodes.Status202Accepted });
+        var producesResponseTypeMetadata = builder.Metadata.OfType<ProducesResponseTypeMetadata>().Last();
+        Assert.Equal(StatusCodes.Status202Accepted, producesResponseTypeMetadata.StatusCode);
+        Assert.Equal(typeof(void), producesResponseTypeMetadata.Type);
     }
 
     [Fact]

src/Http/Http.Results/test/BadRequestResultTests.cs

@@ -56,6 +56,7 @@ public void PopulateMetadata_AddsResponseTypeMetadata()
         // Assert
         var producesResponseTypeMetadata = builder.Metadata.OfType<ProducesResponseTypeMetadata>().Last();
         Assert.Equal(StatusCodes.Status400BadRequest, producesResponseTypeMetadata.StatusCode);
+        Assert.Equal(typeof(void), producesResponseTypeMetadata.Type);
     }
 
     [Fact]

src/Http/Http.Results/test/ConflictResultTests.cs

@@ -57,6 +57,7 @@ public void PopulateMetadata_AddsResponseTypeMetadata()
         // Assert
         var producesResponseTypeMetadata = builder.Metadata.OfType<ProducesResponseTypeMetadata>().Last();
         Assert.Equal(StatusCodes.Status409Conflict, producesResponseTypeMetadata.StatusCode);
+        Assert.Equal(typeof(void), producesResponseTypeMetadata.Type);
     }
 
     [Fact]

src/Http/Http.Results/test/CreatedAtRouteResultTests.cs

@@ -81,6 +81,7 @@ public void PopulateMetadata_AddsResponseTypeMetadata()
         // Assert
         var producesResponseTypeMetadata = builder.Metadata.OfType<ProducesResponseTypeMetadata>().Last();
         Assert.Equal(StatusCodes.Status201Created, producesResponseTypeMetadata.StatusCode);
+        Assert.Equal(typeof(void), producesResponseTypeMetadata.Type);
     }
 
     [Fact]

src/Http/Http.Results/test/CreatedResultTests.cs

@@ -74,6 +74,7 @@ public void PopulateMetadata_AddsResponseTypeMetadata()
         // Assert
         var producesResponseTypeMetadata = builder.Metadata.OfType<ProducesResponseTypeMetadata>().Last();
         Assert.Equal(StatusCodes.Status201Created, producesResponseTypeMetadata.StatusCode);
+        Assert.Equal(typeof(void), producesResponseTypeMetadata.Type);
     }
 
     [Fact]

src/Http/Http.Results/test/NoContentResultTests.cs

@@ -53,6 +53,7 @@ public void PopulateMetadata_AddsResponseTypeMetadata()
         // Assert
         var producesResponseTypeMetadata = builder.Metadata.OfType<ProducesResponseTypeMetadata>().Last();
         Assert.Equal(StatusCodes.Status204NoContent, producesResponseTypeMetadata.StatusCode);
+        Assert.Equal(typeof(void), producesResponseTypeMetadata.Type);
     }
 
     [Fact]

src/Http/Http.Results/test/NotFoundResultTests.cs

@@ -52,6 +52,7 @@ public void PopulateMetadata_AddsResponseTypeMetadata()
         // Assert
         var producesResponseTypeMetadata = builder.Metadata.OfType<ProducesResponseTypeMetadata>().Last();
         Assert.Equal(StatusCodes.Status404NotFound, producesResponseTypeMetadata.StatusCode);
+        Assert.Equal(typeof(void), producesResponseTypeMetadata.Type);
     }
 
     [Fact]

src/Http/Http.Results/test/OkResultTests.cs

@@ -56,6 +56,7 @@ public void PopulateMetadata_AddsResponseTypeMetadata()
         // Assert
         var producesResponseTypeMetadata = builder.Metadata.OfType<ProducesResponseTypeMetadata>().Last();
         Assert.Equal(StatusCodes.Status200OK, producesResponseTypeMetadata.StatusCode);
+        Assert.Equal(typeof(void), producesResponseTypeMetadata.Type);
     }
 
     [Fact]

src/Http/Http.Results/test/UnprocessableEntityResultTests.cs

@@ -56,6 +56,7 @@ public void PopulateMetadata_AddsResponseTypeMetadata()
         // Assert
         var producesResponseTypeMetadata = builder.Metadata.OfType<ProducesResponseTypeMetadata>().Last();
         Assert.Equal(StatusCodes.Status422UnprocessableEntity, producesResponseTypeMetadata.StatusCode);
+        Assert.Equal(typeof(void), producesResponseTypeMetadata.Type);
     }
 
     [Fact]

src/Shared/ApiExplorerTypes/ProducesResponseTypeMetadata.cs

@@ -19,7 +19,7 @@ internal sealed class ProducesResponseTypeMetadata : IProducesResponseTypeMetada
     /// </summary>
     /// <param name="statusCode">The HTTP response status code.</param>
     public ProducesResponseTypeMetadata(int statusCode)
-        : this(type: null, statusCode, Enumerable.Empty<string>())
+        : this(typeof(void), statusCode, Enumerable.Empty<string>())
     {
     }